Influence of Axial Force Servo on Foundation Pit Support and Existing Tunnel Based on Numerical Simulation and Field Monitoring
Based on the foundation pit engineering of Fuzhou Railway Station of Binhai Expressway,the whole excava-tion process of foundation pit adjacent to the existing tunnel was simulated on the FLAC3D numerical platform.The ax-ial force servo for brace was considered by applying a pair of concentrated forces at the end nodes of beam element.The variations of the horizontal displacement of retaining wall,the axial force of brace and the horizontal displacement of adjacent existing tunnel were calculated which was then compared with the field monitoring data.The analyses re-sults showed that setting the designed axial force as servo-value is more reasonable for the 4th and 5th steel braces.The horizontal displacements of retaining wall and existing tunnel could be reduced effectively,and the distribution of axial forces on each braces became more uniform.
foundation pit engineeringaxial force servo for braceadjacent existing tunnelnumerical simula-tionfield monitoring
万方数据
维普
